docs: added more information to readme

.github/workflows/docker-publish.yml

@@ -1,4 +1,4 @@
-name: Docker
+name: Docker Build
 
 on:
   push:

README.md

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 # ModX Revolution Docker
+![Docker Build](https://github.com/749/docker-modx-revolution/actions/workflows/docker-publish.yml/badge.svg)
+
 A docker setup that can autoupdate ModX Revolution.
 
+*This is a heavily modified version of the FPM variant of [the official Docker Image](https://github.com/modxcms/docker-modx).*
+
 ## Simplified Usage
 1. Copy the `.env.example` file to `.env`
 2. Run `docker-compose up`
-3. The Webserver will now listen on Ports `80` and `443`
+3. The Webserver will now listen on Ports `80` and `443`
+
+## General
+The build is completely automated, running every sunday at 00:00/GMT+0.
+
+It pulls in the latest 2.X version of ModX Revolution, based on the tags on the [Modx Revolution Tags](https://github.com/modxcms/revolution/tags).
+
+The build produces convenience tags so `2.8.3` is also tagged `2.8` and `2`
+
+__NOTE__: currently the build does not support building new versions for older minor tags. For Example the current minor is `2.8` and a new patch version commes out for `2.7`. A discussion issue is open at: [#1](https://github.com/749/docker-modx-revolution/issues/1)